I used to play this game about 6 years ago, but I forgot the previous account so I made this new one.

I currently own purebred Quarters and Mustangs. I usually sell baby horses with more than 1500 GP.

I have done some math (chi-squared test) for unicorn breeding. Here is a graph for oddness of getting unicorns:

Red: significance level 0.5%

Orange: significance level 1%

Yellow: significance level 5% (this is the main threshold used for statistics)

Green: significance level 10%

Blue: no significance

Basically, yellow ~ red means that your statistics of unicorn breeding might have a different rate than the 1/5 chance (for normal accounts). Particularly, if you're getting 1 unicorn out of more than 26 tries, for instance, you should doubt the Howrse system, not your luck.